A Prophylactic Gel to Stop TransmissionMarried Thai women have become an AIDS risk group. But in Thailand, as in many societies, women are in no position to tell their husbands to use condoms. That's giving new urgency to the drive to develop a gel that women can use to prevent HIV infection. NPR's Richard Knox reports.

Married Thai women have become an AIDS risk group. But in Thailand, as in many societies, women are in no position to tell their husbands to use condoms. That's giving new urgency to the drive to develop a gel that women can use to prevent HIV infection. NPR's Richard Knox reports.